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Yes, we're all entitled to our opinions. The thing is, you projected your opinion as a fact; your wording asserted that no step-mother can be a parent, when you could've just said "my step-mom isn't like a parent to me".

It's an important distinction, one which you didn't make; I think that's why you raised some hackles here.

Why on earth would would it happen often enough to "get used to it"?
I think most adults avoid saying things like that around their children (grown or not). Making eyes or sneaky whispers and hints, maybe, by it not just outright and on purpose.

Not everyone has biological parents who are living, or nice people. Some people consider their step mom a parent and love her as they would a biological parent. Just because you don't like your step mother, doesn't mean other people can't think of theirs as a parent.

That's not as bad as a drunk stepdad perverting a classic Dr. Seuss book on my mother by saying "One fish (twist her nipple), two fish (twist her other nipple), red fish (grab her waist), blue fish (thrust himself on her)!"

We were at a family friendly party, and the adults got a tad too drunk. Clothes remained on, but still it wasn't kid friendly anymore. Not something a 13 year old kid is expecting to see when he walks into the kitchen for a glass of water.

Not just normal but desirable and a good thing. Couples should have a healthy sex life, even if they have kids old enough to be on fml. News flash, most of our grandparents are probably still knocking boots regularly if their health allows.

The majority of people don't really want to think about relatives having sex. They know it's likely that they are, but having it discussed right in front of you kind of forces you to think about it. Also plenty of couples don't have sex. It's not a requirement for a healthy relationship if it's mutually agreed that they don't find it mandatory.